Disk and like grinding mill



1. R. TORRANQE. DISK AND LIK GRINDING MILL.

A PPLCATION FILED JULY 7. 1919.

patented Feb. 7,"1922f g SHEETS-sum1.

/zerz Y A TTO A/E v l. R. TORRANCE.

DISK AND LIK E GIRIND'ING'MILL. APPLICATION man J-uLY 1, 1919'.

1,405,878. Patented Feb.7,1922.

2 SHEETS-SHEET 2.

' and lateral bodily movement.

UNITEDsTATLEs `JOHN ROWLAND roRRANcn, or Brr'roN, ENGLAND.

ATENT o FFlcE'.-

Disiz AND LIKE GRIINDINGMILL." i

:Specification of Letters Patent.

vPatented"Feb. 7, 1922.

Appncatin LiileaJuiy 7, 1919. serial No. 309,188.

To all whom t may concern:

Be it known that I, JOHN ROWLAND Ton- RANCE, a'subject ofthe King of Great Britain, residing lat Bitten, England, have 'invented certain new and useful Improvements in and Relating to Disk and like Grinding Mills, of which the following is a Specification.

The present invention is 'for improvements in and relating to disk andy like grinding mills, which can be suited `or adapted to both dry grinding and to grinding fluids or mixtures which become fluidv after grinding, particularly kof the type of or sweeper is movable in sychronism with they nutating or wavering and rotating grinding member. Y

The present invention yisv directed to a mill of the type in whichv the grinding members are two fiat disks of stone, porcelain, metal or like, and in which the grinding members while held in the required proximity with each other grind one over the other withva compound relative rotary In a flat stone mill of this type having a rotating-and usually lower. member, it has` been proposed'to give to the rotating 'member a supplementary Vmotionto cause it to move bodily over its companion member with a continual change of position, by imparting to' the running stone an orbital or planetary motion so that instead of runningV in true concentricity with .its companion stone it is moving in and out in a progressive vmanner in relation to themargin of itscompanionstone. f

Inpractice in order to produce ground material of high quality a slow'jlateral orv orbital or,y planetary motion of the ,runningmembern is desirable in relation to the rota- Fig. 1 is a 'sectional y constructed in accordance with the present 'tory' motion, for, otherwise the outfeed of fthe material is too rapid, and further 'there isjsubversive vibration.` Amongst Vthe objects of Vthe present inventionl is the overset forth bythe provision of a mill wherein a high velocity ratio between the rotatory drive and thelateral bodily drive, each Y ydriven from a common main shaft is ef-"f fected, by intermediate worm gearing as the bodily drive, whereby a compact, smooth running, and notablyfine grinding mill is made possible.. Under an exemplar form of the inventionv gearing is introduced between-Y the counter shaft carrying the worm gearing and the main drive by which the velocity ratio betweenV the rotatory drive and the lateral bodily drive may be varied up vcoming kor minimizing of the defects above or down as desired without lchanging the worm gearing.

To the above and other ends and by way of example, I will describe a form of fiatstone mill which works well, in which the ment of the running stone is imparted by means of a shaft in a rotating eccentric In theaccompanyingv drawings is illustrated in detail and by way of example an application of the invention to a paint mill, inwhich mill by actual test, the following speeds have been found suitable:

Driving shaft 255 revolutions a minute.

Rotatory speed of stone 85 revolutions a minute. v v

Velocity ratio between drive and rotatory speed 3 to 1 reduction.

Velocity Vratio between drive and lateralV bodily drive 38 to 1 reduction.

Velocity* ratio betweenrotatory speed and lateral bodily drive 12.6 reduction.

In the drawings I elevation of a mill invention. Fig. 2 is a side View thereof looking from kright to left of Fig, 1.

' Fig, 3 is a plan section to van enlarged lcompound rotary and lateral bodily movescale of the main bearing, eccentric bush, M and rotatingA shaft of the grinding member; l

Fig. 4 is a sectional elevation showing one formof driveffc'ir the rotating shaft of the grinding member, also 'the rocking'footstep bearing forV the rotating shaft and the grinding pressure adjusting'arm or lever.

los

vor adapted for grinding iiuids, while Figs.

lland` l2 are elevation andplan respectively of a 'revolving scraper which may be used in lieu of the aforesaid scraper or for dry grinding.A Y i Fig. 13 is a View of a 'former worm drive for imparting the lateral bodily drive to-the running member. Y

As villustrated the mill comprises two grinding members or disks a and. b of stone, porcelain, metal vor the like, the upper disk a of lwhich is stationary. This upper `disk y a isfixed to al cover plate c carrying a hopper d through which the material to be ground,

passes to the grinding surfaces.

The lower ydisk Z) is ixedly carried by a rotating shaft e mounted in a rotating eccentric bushor sleeve f, this bush or sleeve being mounted .and running concentricallyL in a main neck bearing gliformin'g a lined part of the lower casing h of the grinding `Amembers. A compound rotary and lateral bodily movement of the lower disk b' :is effected byiiXing the saine torotate with the yshaft e, which shaft is mounted in the rotating eccentric bush f mounted and running concentrically in the main bearing g whereby the axis of the disk b is caused to generate a cylinder about the produced normal aXis of the companion grinding inember a, and Ythere is realized a combined lateral and circular grinding action witha progressive moving in and out of the ro tating grinding member Z) in relation to the stationary grinding member a. 'The means lfor imparting this compound rotary and lateral bodily movement is hereinafter referred to.

The lower end of Vthe shaft e is rotatably mounted in the upper end of a rocking footstep bea-ring z' to allow for the throw of the I eccentric. A ball thrust bearing j forre- 'ceiving the shaft e is; provided 'at the top end of the `pillar of the vfootstep bearing.

`'Iheffootstep bearing el is supported so as to be capable of adjustment for height to vary the grinding pressure. As shown, the bearing 1s carried in a socket 7" byl a pivoted Varm eadapted tobe raised or lowered by Va 4screw adjustment Z bearing-in a' bracket m on the frame n of the-mill Amain driving shaft 0 having fast and loose vpulleys 37,29 is borne' in standards 7 on the frame a. Drive ofthe eccentric bush or Asleeve f is by a worms and worm wheel'H Athe grinding pressurev adjusting arm or lever. -v Y t, The worin` s is on a sha-ft u borne by a bearingw depending from Ya ring fixed upon the outside of lthe ina-inneck bearing g, and the worm wheel t isfon the eccentric;v bush or sleeve'f. `rPhe worm sha-tt is driven from the main driving shaft o by means of spun wheels '3L/y. By v changing the Yspur wheels the `power oit vvarying Vthe velocity-p,

ratio upor down between the sleeve andthe f Y' 4V'7'5 The drive of the shaft e ofthe grinding` shaft `mayvY-be eected.

member b is bya bevel geary fromthe mainv driving shaft- Rei'erringto Figs; 5 and 8 a bevel wheel l is rotatably mounted on the eccentric'bush ff and is ldriven byfa bevelv wheel 2 on the main driving'gshatt 0'. The bevel wheel l carries a depending tubular piece 3` in which are radial grooves V4 within which co-operate projections 5 fixed on the lower end of theshaft e of the Y grinding member b.' ,Y The' width of these projections 5 and grooves 4 'are so relatively proportioned that 'the continuous hypot'rochoidal 'or similar Vmotion of theshaft is allowed for, and the drive taken up by each horn in sequence.

In the alternative form of drive asillus trated by Figs. 4 and? the depending tubu- Vlar Vpiece 3 is formed or providedwith Vvan internally toothed ring 6 adapted to engage a pinion7 rformed or provided Von the' lower end of the shait e of the grinding member b. lVhen the mill is suitedY or adapted for grinding fluids, a scraper or docto7 is' provided for cleaning'the edge of theV grinding inemberb. As shown 1n Figs, 9 and l0 theV scraper 8 is carried in a V.fitting 8a on an arm 9 which extends from a ring or bush lO loosely mounted on the neckof the eccentric :bush or sleeve f@ The arm passes through a guide ll-and moves in synchro- .i

V,nism'with 'thelateralfbodily movement of the rotating grindingmember I). A scraper or doctor may also'be used when glildg dry material. For givingthe desired. yielding pressure of the scraper on the grinding member, an adjustment-of the fitting 8va isprovided for by meansl Yof a screw Sbjfwith' interposed sprin 8- j f In igs. 11 and 12is'shown an alternative form of scraper or -doctor. In this ar-` rangement the arm 9 isffast with the neck` Y ofV the eccentric bush or sleeve f so aste revolve'therewith. TheY arm has 'connected thereto a scraper V12 and a sweeper 13-for keeping the annulus 14 clean, thus operating Ato sweep any ,droppings vtotheV delivery Youtlet, as well 'as to; cleanthe outer edge of the grinding. member I). A-scraper orV doctor may also be used when grindingdry materials. I i

For Y v'grinding mixtures comprising ai volatilecomponent the feeding Vhopper is'` covered in, andja. sliding, door 144 and delivery chute 15 is provided in the casing 71, which encloses the grinding members.

A stirrer or sweeper 16 may when desired be provided on the hopper d, the sweeper being coupledv to the upper end of the shaft e andrevolved therewith. v Whilst the ydisk members have been" described as being superimposed, they may be arranged on their sides, in which caseV thev drive would be suitably varied tosuit requirements. e y

The grinding disks'may be so arranged that means can be embodied therein, for eX- ample, by a Water circulatory system, for cooling purposes.

The companion stone in some cases lmay be caused simultaneously tochange position, for example, by a slow horizontal motion or motion 1n the plane of the stone in vtwo directions at right angles.

What I claim is 1. A drive for a grinding mill of the 'type' Vdescribed having in combination a common main shaft, means for imparting a rotary drive to the grinding disk carrying shaft mounted in the rotating eccentric bush, said means comprising a bevel. gear, the driven bevel of which is rotatably mounted on the eccentric bush, a tubular piece carried by said driven bevel, radial slots in said tubular piece, projections fixed on the lower end of e the disk carrying shaft, said projections cooperating with the radial slots in the tubular piece, and means comprising worm gearing for imparting the bodily drive to the grinding disk, said latter means being also driven from'said common main shaft.

v2. A drive for a grinding mill of the type described having in combination a common `main shaft,- means for imparting a rotatory drive to the grinding disk .carrying shaft mounted in the rotating Veccentric n bush, said means comprising a bevel gear, the drivenbevel of which is rotatably mounted on the eccentric bush, Va-tubular piece carried by said driven bevel, radial slots in said tubular piece, projections fixed on the Vlower end of the disk carrying shaft, said lprojections cO-operating `with the radial .slots 11n the tubular piece, a counter shaft,

means comprising worm gearing carried by said counter shaft for imparting the bodily drive to the. grinding disk, land gearing introduced between the main shaft and the counter shaft for the purpose set forth.v

3. Adrive for a grinding .mill of the kind ydescribed'having in combination a common vmain shaft, means for imparting a rotatory drive to the grinding disk carrying shaft mounted in the rotating eccentric bush, said means comprising a bevel gear, the driven bevel of which is rotatably mounted on the eccentric bush, a tubular piece for drive transmission from said drlven bevel, co-

operating connecting radial slots and pro- JOHN RowLAND TORRANCE. 

